blob: 3a96cebef8a77b1a756969074cba361d01ccd079 [file] [log] [blame]
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package lsp
import (
"bytes"
"context"
"fmt"
"golang.org/x/tools/internal/jsonrpc2"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/lsp/source"
"golang.org/x/tools/internal/span"
errors "golang.org/x/xerrors"
)
func (s *Server) didOpen(ctx context.Context, params *protocol.DidOpenTextDocumentParams) error {
_, err := s.didModifyFiles(ctx, []source.FileModification{
{
URI: span.NewURI(params.TextDocument.URI),
Action: source.Open,
Version: params.TextDocument.Version,
Text: []byte(params.TextDocument.Text),
LanguageID: params.TextDocument.LanguageID,
},
})
return err
}
func (s *Server) didChange(ctx context.Context, params *protocol.DidChangeTextDocumentParams) error {
uri := span.NewURI(params.TextDocument.URI)
text, err := s.changedText(ctx, uri, params.ContentChanges)
if err != nil {
return err
}
c := source.FileModification{
URI: uri,
Action: source.Change,
Version: params.TextDocument.Version,
Text: text,
}
snapshots, err := s.didModifyFiles(ctx, []source.FileModification{c})
if err != nil {
return err
}
snapshot := snapshots[uri]
if snapshot == nil {
return errors.Errorf("no snapshot for %s", uri)
}
// Ideally, we should be able to specify that a generated file should be opened as read-only.
// Tell the user that they should not be editing a generated file.
if s.wasFirstChange(uri) && source.IsGenerated(ctx, snapshot, uri) {
if err := s.client.ShowMessage(ctx, &protocol.ShowMessageParams{
Message: fmt.Sprintf("Do not edit this file! %s is a generated file.", uri.Filename()),
Type: protocol.Warning,
}); err != nil {
return err
}
}
return nil
}
func (s *Server) didChangeWatchedFiles(ctx context.Context, params *protocol.DidChangeWatchedFilesParams) error {
var modifications []source.FileModification
for _, change := range params.Changes {
uri := span.NewURI(change.URI)
// Do nothing if the file is open in the editor.
// The editor is the source of truth.
if s.session.IsOpen(uri) {
continue
}
modifications = append(modifications, source.FileModification{
URI: uri,
Action: changeTypeToFileAction(change.Type),
OnDisk: true,
})
}
_, err := s.didModifyFiles(ctx, modifications)
return err
}
func (s *Server) didSave(ctx context.Context, params *protocol.DidSaveTextDocumentParams) error {
c := source.FileModification{
URI: span.NewURI(params.TextDocument.URI),
Action: source.Save,
Version: params.TextDocument.Version,
}
if params.Text != nil {
c.Text = []byte(*params.Text)
}
_, err := s.didModifyFiles(ctx, []source.FileModification{c})
return err
}
func (s *Server) didClose(ctx context.Context, params *protocol.DidCloseTextDocumentParams) error {
_, err := s.didModifyFiles(ctx, []source.FileModification{
{
URI: span.NewURI(params.TextDocument.URI),
Action: source.Close,
Version: -1,
Text: nil,
},
})
return err
}
func (s *Server) didModifyFiles(ctx context.Context, modifications []source.FileModification) (map[span.URI]source.Snapshot, error) {
snapshots, err := s.session.DidModifyFiles(ctx, modifications)
if err != nil {
return nil, err
}
snapshotByURI := make(map[span.URI]source.Snapshot)
for _, c := range modifications {
snapshotByURI[c.URI] = nil
}
// Avoid diagnosing the same snapshot twice.
snapshotSet := make(map[source.Snapshot][]span.URI)
for uri := range snapshotByURI {
view, err := s.session.ViewOf(uri)
if err != nil {
return nil, err
}
var snapshot source.Snapshot
for _, s := range snapshots {
if s.View() == view {
if snapshot != nil {
return nil, errors.Errorf("duplicate snapshots for the same view")
}
snapshot = s
}
}
// If the file isn't in any known views (for example, if it's in a dependency),
// we may not have a snapshot to map it to. As a result, we won't try to
// diagnose it. TODO(rstambler): Figure out how to handle this better.
if snapshot == nil {
continue
}
snapshotByURI[uri] = snapshot
snapshotSet[snapshot] = append(snapshotSet[snapshot], uri)
}
for snapshot, uris := range snapshotSet {
for _, uri := range uris {
fh, err := snapshot.GetFile(uri)
if err != nil {
return nil, err
}
// If a modification comes in for a go.mod file,
// and the view was never properly initialized,
// try to recreate the associated view.
switch fh.Identity().Kind {
case source.Mod:
newSnapshot, err := snapshot.View().Rebuild(ctx)
if err != nil {
return nil, err
}
// Update the snapshot to the rebuilt one.
snapshot = newSnapshot
snapshotByURI[uri] = snapshot
}
}
go s.diagnoseSnapshot(snapshot)
}
return snapshotByURI, nil
}
func (s *Server) wasFirstChange(uri span.URI) bool {
if s.changedFiles == nil {
s.changedFiles = make(map[span.URI]struct{})
}
_, ok := s.changedFiles[uri]
return ok
}
func (s *Server) changedText(ctx context.Context, uri span.URI, changes []protocol.TextDocumentContentChangeEvent) ([]byte, error) {
if len(changes) == 0 {
return nil, jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "no content changes provided")
}
// Check if the client sent the full content of the file.
// We accept a full content change even if the server expected incremental changes.
if len(changes) == 1 && changes[0].Range == nil && changes[0].RangeLength == 0 {
return []byte(changes[0].Text), nil
}
return s.applyIncrementalChanges(ctx, uri, changes)
}
func (s *Server) applyIncrementalChanges(ctx context.Context, uri span.URI, changes []protocol.TextDocumentContentChangeEvent) ([]byte, error) {
content, _, err := s.session.GetFile(uri).Read(ctx)
if err != nil {
return nil, jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "file not found (%v)", err)
}
for _, change := range changes {
// Make sure to update column mapper along with the content.
converter := span.NewContentConverter(uri.Filename(), content)
m := &protocol.ColumnMapper{
URI: uri,
Converter: converter,
Content: content,
}
if change.Range == nil {
return nil, jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "unexpected nil range for change")
}
spn, err := m.RangeSpan(*change.Range)
if err != nil {
return nil, err
}
if !spn.HasOffset() {
return nil, jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "invalid range for content change")
}
start, end := spn.Start().Offset(), spn.End().Offset()
if end < start {
return nil, jsonrpc2.NewErrorf(jsonrpc2.CodeInternalError, "invalid range for content change")
}
var buf bytes.Buffer
buf.Write(content[:start])
buf.WriteString(change.Text)
buf.Write(content[end:])
content = buf.Bytes()
}
return content, nil
}
func changeTypeToFileAction(ct protocol.FileChangeType) source.FileAction {
switch ct {
case protocol.Changed:
return source.Change
case protocol.Created:
return source.Create
case protocol.Deleted:
return source.Delete
}
return source.UnknownFileAction
}